Air pressure on the surface of the Earth is fairly constant, so in designing a microphone for use on land, engineers don't have to worry about large variations in air pressure.

地球表面的气压相对稳定，因此设计地面用的传音器，工程师并不需烦恼气压的大幅变化。

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It was the idea of supporting a craft on a 'pad', or cushion, of low-pressure air, ringed with a curtain of higher pressure air.

用一个低压空气或软垫来支撑船体，软垫周围用高压空气环绕。

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In the air compressor control systems, the air compressor vent pipe on the installation of pressure sensor to control the air compressor of pressure.

在空气压缩机控制系统中，采用空压机后端出气管道上安装的压力传感器来控制空气压缩机的压力。

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Yet up at about five-thousand-four hundred meters the air pressure is only about half of what it is on the ground.

VOA: special.2011.04.06

Bigger livestock herds are putting greater pressure on land resources and disrupting some ecosystems and the animals generate significant amounts of water and air pollution, including methane, a climate-changing greenhouse gas.

VOA: standard.2010.02.22

If I take 7 lbs. of air pressure out of a balloon and replace it with 3 lbs. of air pressure, is the balloon inflated or deflated from its previous state?

FORBES: Don't Get Hyped Up About Hyperinflation

The new command centre, in a secret location, will clearly be highly vulnerable to air attack by the regime - something that could increase pressure for some kind of international air cover for the "liberated areas", our correspondent says.

BBC: Free Syrian Army 'move command centre inside Syria'

Spreading the area of air pressure over the jet staggers the sound waves and decreases the intensity of the boom.

CNN: Bang goes the sonic boom